Now you can experience a whopping 80% increase in power out of your Smart car! This literally turns this car from the slowest thing on the road to a car that will shove you into your seat when the pedal hits the metal. Stage 1 Smart 451 turbo system runs at 5 psi of boost pressure. This delivers anywhere from 85-90 WHP. A big improvement from the 50 horsepower a bone stock.